Oil source switching valve

Abstract

The invention relates to the field of valves, in particular to an oil source switching valve which comprises a valve body, a main valve sleeve is arranged in the valve body, a main valve element is arranged in the main valve sleeve in a sliding mode, and a first pressure cavity and a second pressure cavity are formed in the two ends of the main valve element respectively; the plug-in mounting type pilot valve has the beneficial effects that the pressure cavities between the plug-in mounting type pilot valve and the main valve sleeve are directly connected, when the pilot valve is powered on, the interior of the first pressure cavity is high, and when the pilot valve is powered off, the interior of the first pressure cavity is low; under the pressure difference effect of the first pressure cavity and the second pressure cavity at the two ends of the main valve element, the main valve element is driven to move left and right in the main valve sleeve, and it is guaranteed that oil way switching is reliable and stable.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to an oil source switching valve. Background Art

[0002] In hydraulic transmission and control systems, the oil source switching valve, as a key flow control component, plays a vital role. It is mainly used in complex transmission systems to flexibly switch between different oil sources according to actual needs to ensure stable operation and efficient performance of the system. The working principle of the oil source switching valve is mainly based on the pressure difference or hydraulic principle. By sensing the pressure change of the hydraulic oil, the valve core is pushed to move, thereby accurately opening or closing the oil circuit connected to different oil sources, realizing smooth switching of the oil source.

[0003] However, the traditional oil source switching valve has some inherent limitations in design and application. Among them, the most significant problem lies in the connection method of its pilot valve. Traditional oil source switching valves generally use plate connection to install the pilot valve. This connection method not only takes up a large space, increases the volume and weight of the entire valve body, is not conducive to the lightweight design of the product, but also brings additional challenges to the integration and layout of the system.

[0004] In addition, the pilot valve with plate connection also has a certain pressure loss problem. Since there is a certain distance between the output port of the pilot valve and the moving pressure chamber that controls the main valve core, the hydraulic oil will experience a certain pipeline resistance and pressure drop during the transmission process, which will not only reduce the overall efficiency of the system, but also may affect the accuracy and stability of the oil source switching. This pressure loss problem is particularly prominent in high-pressure and high-flow working environments.

[0005] Therefore, an oil source switching valve is needed to overcome the above problems. Summary of the invention

[0006] In order to solve the above problems, an embodiment of the present invention provides an oil source switching valve, which achieves the purpose of solving the problems raised in the background technology.

[0007] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: an oil source switching valve, comprising a valve body, a main valve sleeve is arranged inside the valve body, a main valve core is slidably arranged inside the main valve sleeve, and pressure chamber 1 and pressure chamber 2 are respectively arranged at two ends of the main valve core;

[0008] A pilot valve is inserted on the valve body; the pilot valve comprises a pilot valve sleeve inserted in the valve body, a pilot valve core arranged inside the pilot valve sleeve, and a driving assembly arranged on the valve body for driving the pilot valve core to rotate; a secondary P chamber, a secondary O chamber and a C chamber are formed between the pilot valve sleeve and the pilot valve core;

[0009] The C chamber is in communication with the pressure chamber.

[0010] As a further improvement of the above technical solution:

[0011] The driving assembly includes a shift fork fixedly connected to the valve core of the pilot valve, a shift rod rotatably arranged on the valve body, a limit seat fixedly connected to the valve body, a spring sleeved on the limit seat, and a rotating electromagnet arranged inside the valve body for driving the shift rod to rotate; wherein, one end of the shift rod is engaged with the end of the shift fork, and the other end of the shift rod is slidably arranged on the limit seat.

[0012] The main valve sleeve is provided with a P chamber, an A chamber, a B chamber and an O chamber inside.

[0013] The valve body is provided with an oil inlet end connected to the P chamber, a working end 1 connected to the A chamber, a working end 2 connected to the B chamber, and an oil return end connected to the O chamber.

[0014] The P chamber is communicated with the auxiliary P chamber, and the O chamber is communicated with the auxiliary O chamber.

[0015] The pressure chamber 2 is communicated with the O chamber, and a return spring 1 is arranged inside the pressure chamber 2.

[0016] A bearing is arranged inside the pilot valve sleeve, the pilot valve core is sleeved inside the bearing, and a second return spring is sleeved outside the pilot valve core.

[0017] The shift fork, shift rod, limit seat and spring are all arranged outside the valve body.

[0018] The valve body is provided with a damping hole used in conjunction with the main valve core.

[0019] The beneficial effects of the embodiments of the present invention are:

[0020] C chamber is connected with pressure chamber 1; C chamber is directly connected with pressure chamber 1, so that C chamber can quickly and directly enter the interior of pressure chamber 1, that is, the hydraulic pressure of the pilot valve can be directly transmitted to the main valve core, the oil circuit switching can be completed quickly, and the pressure loss is small;

[0021] The pilot valve is inserted into the valve body, which requires less space than conventional plate-type connections and has a higher degree of integration;

[0022] The pressure chamber between the plug-in pilot valve used in the present application is directly connected to the main valve sleeve. When the pilot valve is energized, the inside of the pressure chamber 1 is high pressure, and when the pilot valve is de-energized, the inside of the pressure chamber 1 is low pressure. Under the action of the pressure difference between the pressure chamber 1 and the pressure chamber 2 at both ends of the main valve core, the main valve core is driven to move left and right in the main valve sleeve, ensuring reliable and stable oil circuit switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at the center A;

[0025] Figure 3 It is a structural schematic diagram of the valve body of the present invention;

[0026] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0027] In the figure: 1. valve body; 2. main valve sleeve; 3. main valve core; 4. pressure chamber 1; 5. pressure chamber 2; 6. pilot valve; 7. P chamber; 8. A chamber; 9. B chamber; 10. O chamber; 11. oil inlet end; 12. working end 1; 13. working end 2; 14. oil return end; 15. reset spring 1; 16. damping hole;

[0028] 61. Pilot valve sleeve; 62. Pilot valve core; 63. Auxiliary P chamber; 64. Auxiliary O chamber; 65. C chamber; 66. Drive assembly; 67. Return spring 2; 68. Bearing;

[0029] 661, shift fork; 662, shift rod; 663, limit seat; 664, spring; 665, rotating electromagnet. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0031] See also Figures 1 to 4 The embodiment of the present invention discloses an oil source switching valve, comprising a valve body 1, a main valve sleeve 2 is arranged inside the valve body 1, a main valve core 3 is slidably arranged inside the main valve sleeve 2, and pressure chamber 1 4 and pressure chamber 2 5 are respectively arranged at both ends of the main valve core 3;

[0032] A pilot valve 6 is inserted on the valve body 1; the pilot valve 6 comprises a pilot valve sleeve 61 inserted in the valve body 1, a pilot valve core 62 arranged in the pilot valve sleeve 61, and a driving assembly 66 arranged on the valve body 1 for driving the pilot valve core 62 to rotate; a secondary P chamber 63, a secondary O chamber 64 and a C chamber 65 are formed between the pilot valve sleeve 61 and the pilot valve core 62; the secondary P chamber 63 is an oil inlet chamber, and the secondary O chamber 64 is an oil return chamber;

[0033] The C chamber 65 is connected to the pressure chamber 14; the C chamber 65 is directly connected to the pressure chamber 14, so that the C chamber 65 can quickly and directly enter the interior of the pressure chamber 14, that is, the hydraulic pressure of the pilot valve 6 can be directly transmitted to the main valve core 3, the oil circuit switching can be completed quickly, and the pressure loss is small;

[0034] The pilot valve 6 is inserted into the valve body 1, which requires less space than conventional plate-type connections and has a higher degree of integration;

[0035] In the initial state, the auxiliary P chamber 63 and the auxiliary O chamber 64 are connected, so that the pressure oil in the auxiliary P chamber 63 enters the auxiliary O chamber 64 for oil return; when the driving component 66 drives the pilot valve core 62 to rotate, the auxiliary P chamber 63 and the C chamber 65 are connected, so that the pressure oil in the auxiliary P chamber 63 enters the C chamber 65, and then the pressure oil enters the pressure chamber 1-4 through the C chamber 65. At this time, the pressure of the pressure chamber 1-4 increases, pushing the main valve core 3 to move, and the switching of the working position can be completed;

[0036] The plug-in pilot valve 6 used in the present application is directly connected to the pressure chamber between the main valve sleeve 2. When the pilot valve 6 is energized, the inside of the pressure chamber 1 4 is high pressure. When the pilot valve 6 is de-energized, the inside of the pressure chamber 1 4 is low pressure. Under the action of the pressure difference between the pressure chamber 1 4 and the pressure chamber 2 5 at both ends of the main valve core 3, the main valve core 3 is driven to move left and right in the main valve sleeve 2, ensuring reliable and stable oil circuit switching.

[0037] As a further illustration of this application:

[0038] The driving assembly 66 includes a shift fork 661 fixedly connected to the pilot valve core 62, a shift rod 662 rotatably arranged on the valve body 1, a limit seat 663 fixedly connected to the valve body 1, a spring 664 sleeved on the limit seat 663, and a rotating electromagnet 665 arranged inside the valve body 1 for driving the shift rod 662 to rotate; wherein one end of the shift rod 662 is engaged with the end of the shift fork 661, and the other end of the shift rod 662 is slidably arranged on the limit seat 663;

[0039] After power is turned on, the rotating electromagnet 665 drives the lever 662 to rotate, and the lever 662 shifts the shift fork 661 to rotate the pilot valve core 62, so that the auxiliary P chamber 63-auxiliary O chamber 64 connection can be switched to the auxiliary P chamber 63-auxiliary C chamber 65 connection; when power is turned off, the rotating electromagnet 665 no longer provides rotational force to the lever 662. At this time, the lever 662 is reset under the elastic force of the spring 664, so that the lever 662 rotates and shifts the shift fork 661, so that the pilot valve core 62 is reset and rotated, and the auxiliary P chamber 63-auxiliary C chamber 65 connection can be switched to the auxiliary P chamber 63-auxiliary O chamber 64 connection.

[0040] As a further illustration of this application:

[0041] The length of the shift fork 661 is greater than that of the shift rod 662 , so that a cam mechanism is formed between the shift fork 661 and the shift rod 662 for amplifying the force transmission torque of the pilot valve core 62 , thereby improving the reliability of the pilot valve 6 .

[0042] As a further illustration of this application:

[0043] The main valve sleeve 2 is provided with a P chamber 7, an A chamber 8, a B chamber 9 and an O chamber 10;

[0044] In actual use, when the pilot valve 6 is energized, the inside of the pressure chamber 4 is high pressure, causing the main valve core 3 to move to one end. At this time, the P chamber 7-B chamber 9 is connected, and the A chamber 8-O chamber 10 is connected; when the pilot valve 6 is de-energized, the inside of the pressure chamber 4 is low pressure, causing the main valve core 3 to move to the other end. At this time, the P chamber 7-A chamber 8 is connected, and the B chamber 9-O chamber 10 is connected.

[0045] As a further illustration of this application:

[0046] The valve body 1 is provided with an oil inlet end 11 connected to the P chamber 7, a working end 12 connected to the A chamber 8, a working end 2 13 connected to the B chamber 9, and an oil return end 14 connected to the O chamber 10;

[0047] When the pilot valve 6 is energized, the pressure chamber 1 4 is high pressure, causing the main valve core 3 to move to one end. At this time, the P chamber 7 and the B chamber 9 are connected, and the A chamber 8 and the O chamber 10 are connected. At this time, the working position of the valve body 1 is the working end 2 13, that is, the pressure oil enters from the oil inlet end 11 and is discharged from the working end 2 13.

[0048] When the pilot valve 6 is powered off, the pressure chamber 14 is under low pressure, causing the main valve core 3 to move to the other end. At this time, the P chamber 7 and the A chamber 8 are connected, and the B chamber 9 and the O chamber 10 are connected. At this time, the working position of the valve body 1 is the working end 12, that is, the pressure oil enters from the oil inlet end 11 and is discharged from the working end 12.

[0049] That is, the switching between the two working positions is achieved by moving the main valve core 3.

[0050] As a further illustration of this application:

[0051] The P chamber 7 is connected to the auxiliary P chamber 63, and the O chamber 10 is connected to the auxiliary O chamber 64;

[0052] The pressure oil inside the P chamber 7 can enter the interior of the auxiliary P chamber 63, and the pressure oil inside the auxiliary O chamber 64 can enter the interior of the O chamber 10, that is, the oil inlet and return of the pilot valve 6 and the oil inlet and return of the valve body 1 use the same oil circuit, which is convenient for practical use.

[0053] As a further illustration of this application:

[0054] The pressure chamber 2 5 is connected to the O chamber 10, and a return spring 15 is arranged inside the pressure chamber 2 5;

[0055] The pressure oil in the pressure chamber 25 can enter the interior of the O chamber 10 for oil return. When the pressure in the pressure chamber 14 increases, the main valve core 3 is pushed to squeeze the reset spring 15 and then move. When the pressure in the pressure chamber 14 decreases, the main valve core 3 is pushed to reset under the elastic force of the reset spring 15; that is, the reset force of the main valve core 3 is provided by the reset spring 15, and the reset force depends on the stiffness and preload of the reset spring 15, and the reset force is stable and reliable.

[0056] During the resetting process of the main valve core 3, the resetting force of the main valve core 3 is the load of the resetting spring 15. When the resetting displacement of the main valve core 3 is X, the resetting force is F=F1+kX. The resetting force depends on the stiffness and preload of the resetting spring 15.

[0057] As a further illustration of this application:

[0058] A bearing 68 is arranged inside the pilot valve sleeve 61, and the pilot valve core 62 is sleeved inside the bearing 68. A return spring 67 is sleeved outside the pilot valve core 62; the pilot valve core 62 can rotate and move axially inside the pilot valve sleeve 61. The two-dimensional motion can improve the product's anti-pollution ability and product reliability.

[0059] As a further illustration of this application:

[0060] The shift fork 661 , the shift rod 662 , the limit seat 663 , and the spring 664 are all arranged outside the valve body 1 , so as to facilitate the maintenance of the drive assembly 66 .

[0061] As a further illustration of this application:

[0062] The valve body 1 is provided with a damping hole 16 used in conjunction with the main valve core 3, so that a pressure difference is generated when the pressure oil flows, reducing the vibration of the main valve core 3, alleviating the movement impact of the main valve core 3, and allowing it to gradually and smoothly move to the set position during the movement.

[0063] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0064] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0066] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An oil source switching valve, characterized in that: The valve body (1) comprises a main valve sleeve (2) arranged inside the valve body (1), a main valve core (3) slidably arranged inside the main valve sleeve (2), and a pressure chamber 1 (4) and a pressure chamber 2 (5) are respectively arranged at two ends of the main valve core (3); A pilot valve (6) is inserted into the valve body (1); the pilot valve (6) comprises a pilot valve sleeve (61) inserted into the valve body (1), a pilot valve core (62) arranged in the pilot valve sleeve (61), and a driving assembly (66) arranged on the valve body (1) for driving the pilot valve core (62) to rotate; a secondary P chamber (63), a secondary O chamber (64) and a C chamber (65) are formed between the pilot valve sleeve (61) and the pilot valve core (62); The C chamber (65) is communicated with the pressure chamber 1 (4).

2. The oil source switching valve according to claim 1, characterized in that: The driving assembly (66) comprises a shift fork (661) fixedly connected to the pilot valve core (62), a shift rod (662) rotatably arranged on the valve body (1), a limit seat (663) fixedly connected to the valve body (1), a spring (664) sleeved on the limit seat (663), and a rotating electromagnet (665) arranged inside the valve body (1) for driving the shift rod (662) to rotate; wherein one end of the shift rod (662) is engaged with the end of the shift fork (661), and the other end of the shift rod (662) is slidably arranged on the limit seat (663).

3. The oil source switching valve according to claim 1, characterized in that: The main valve sleeve (2) is provided with a P chamber (7), an A chamber (8), a B chamber (9) and an O chamber (10) inside.

4. The oil source switching valve according to claim 3, characterized in that: The valve body (1) is provided with an oil inlet end (11) connected to the P chamber (7), a working end 1 (12) connected to the A chamber (8), a working end 2 (13) connected to the B chamber (9), and an oil return end (14) connected to the O chamber (10).

5. The oil source switching valve according to claim 4, characterized in that: The P chamber (7) is communicated with the auxiliary P chamber (63), and the O chamber (10) is communicated with the auxiliary O chamber (64).

6. The oil source switching valve according to claim 5, characterized in that: The second pressure chamber (5) is connected to the O chamber (10), and a return spring (15) is arranged inside the second pressure chamber (5).

7. The oil source switching valve according to claim 1, characterized in that: A bearing (68) is arranged inside the pilot valve sleeve (61), the pilot valve core (62) is sleeved inside the bearing (68), and a second return spring (67) is sleeved outside the pilot valve core (62).

8. The oil source switching valve according to claim 2, characterized in that: The shift fork (661), the shift rod (662), the limit seat (663), and the spring (664) are all arranged outside the valve body (1).

9. The oil source switching valve according to claim 1, characterized in that: The valve body (1) is provided with a damping hole (16) inside for use with the main valve core (3).

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